we rely on a large overseas highly skilled professional contingent who are here, or educated here. and they're the people who are either -- buying and trying to get their first homes, or sort of moving up. it's very little to buy. >> how different is the short-term prognosis for the long-term? you sponsored this report. michael ball in business school, who said that in the end, property prices in particular were meant to go nowhere but up. why is he arguing that? >> the issue is that london is a growing city and we want it to grow and the economy to grow. the fact that we're not building, the green belt is constraining us, so we've got an issue there. but it's also very, very difficult to build into the center. there are more people coming. but also the aspirations are that much higher. as we earn more -- as the capital becomes more economically strong, people want more for their money and that places greater and greater pressure. it's not just investors coming here. that's a small part of it. it's the business and the economy back to the sort of basic economic theory. >> when a pr